/**
 * Copyright 2009 David Sanderson <mr.davidsanderson@gmail.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
  */
package mr.davidsanderson.uml.client;

import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.shared.GwtEvent.Type;

/**
 * @author dsand
 *
 */
public interface GraphEventBus {
	   
	   /**
	    * Adds this handler to the widget.
	    *
	    * @param  the type of handler to add
	    * @param type the event type
	    * @param handler the handler
	    * @return {@link HandlerRegistration} used to remove the handler
	    */
	   //copied from GWT 1.6 Widget
	   public <H extends EventHandler> HandlerRegistration addHandler(final H handler, Type<H> type);
	 
	   /**
	    * Fire an event.
	    */
	   public void fireEvent(GwtEvent<?> event);

}
